# SDR 2026F00151

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 16, 2026
- Submitted: July 17, 2026
- Operation: General aviation
- Aircraft: [N699CZ](https://openairdocs.org/aircraft/N699CZ), registered now
- Make and model: Beech 99A
- Registry model: [Beech 99A](https://openairdocs.org/model/beech-99a) (OpenAirDocs)
- Aircraft serial: U10
- Aircraft time: 35,480 hours, 43,538 cycles
- System (JASC): [3240 · Landing Gear Brake System](https://openairdocs.org/jasc/3240)
- Part: O-Ring
- Part number: MS28775225
- Condition: Damaged
- Location: Zone 700 Brake
- Part time: 715 cycles
- Component: Brake Caliper, Cleveland
- Component part number: 30146
- Stage of operation: TX
- How discovered: O
- Nature of condition: K
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2026F00151

## Discrepancy

LEFT SIDE BRAKE HAS ZERO PRESSURE IN THE COCKPIT AND PRODUCES NO BRAKING ACTION. UPON SHUTDOWN AND VISUAL INSPECTION, RED FLUID SEEN LEAKING OUT OF LEFT MAIN LANDING GEAR. INSPECTED #1 FWD & AFT CALIPER BRAKE ASSEMBLY, FOUND #1 AFT CALIPER LOWER PUCK LEAKING HYDRAULIC FLUID. REPLACED BRAKE CALIPER.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.